Seat sleeve used on Paramount models: PL2500, PL2600, PL2700.

Note: This is the older orginal seat sleeve with a 1/4" keeper tab. It's replacement is 18000027. If the nipple on it proves too large for the diameter of the hole on the seat post, you can drill it to enlarge it. Using the 1/4" hole as a pilot, drill thru with a 3/8" drill, and then a 9/16" drill. File the inside to remove any burrs. Make sure to remove the gas cylinder if there is one inside the seat post, the seat post itself, and any old sleeves before drilling.